Vintage Transformers 1980s-1990s Unofficial Guide Reference Book J.E. Alvarez
By J.E. Alvarez. Published in 1999 bySchiffer Publishing. : Every chapter details the year-by-year evolution of the toy line, outlining design breakthroughs and shifts in character concepts. : Includes a well-researched, historical price guide matrix paired with checklists to help catalog collections.